The Fulham defender has challenged his side to sharpen up in front of goal for Tuesday night's FA Cup third-round replay against Norwich at Craven Cottage.
Rene Meulensteen's side were swatted aside 4-1 by Sunderland on Saturday, in a dispiriting league defeat in west London that drags Fulham straight back into the relegation picture.
"We had 60 per cent possession (against Sunderland), we dominated possession but we didn't take our chances," Riise told Fulham's official website.
"We should be more experienced to keep control of the game, especially when we got back to 2-1.
"We've been conceding too many goals, especially from set-pieces.
"We have to do better in games like this, and now we've definitely got to get the win against Norwich."
Fulham boss Meulensteen hopes loan signing Clint Dempsey will quickly hit the form that so endeared him to Craven Cottage regulars in his first stint at the club.
United States forward Dempsey, on loan from Seattle Sounders, scored 50 league goals at Fulham between 2007 and 2012.
And after two quick appearances at the start of his second Fulham stint, Meulensteen expects him to hit full form.
"It won't take long for him to be right back up there," said Fulham's head coach.
"He's just got to keep working, but that's his character and that's exactly what we know he will do."
Fulham striker Bryan Ruiz is only paperwork away from a loan move to PSV Eindhoven.
The Costa Rica forward completed a medical on Monday, according to his agent.
"He did have a medical at the club on Monday and I can say that everything went well," Rene Vijt told Press Association Sport.
"Now it is up to the two clubs before anything else can happen."
Ex-Fulham boss Martin Jol made Ruiz his biggest signing in 2011, recruiting the 28-year-old for a reported B£10.6million.
The 61-cap international has struggled to impose himself at Craven Cottage though, and is now set for a swift exit.
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